1986 Jaguar XJS Rough Running

Whats with the A and B on the compression tests? For thetests to vary so much- up to 35 psi on one cylinder. The other was only 100 psi, then it was 130 then 150.......... do a dry comp test then a wet one.You may also need to do aleak down test to see if it has a bad intake valve or two. Have you done anything with the MAP sensor? Also remove the electircal connector off each of the injectors and do an ohm check to see if any of the injectors are shorted. Follow this link for more info

https://www.2carpros.com/first_things/excessive_smoke.htm

please let me know how it goes.

Have you checked the injectors?

Hi
Pull the fuel line off cold start injector attach pressure gague there. Start up what is reading?

Try disconnecting the coolant sensor and 02 sensors. Let me know.

In center of engine up front maybe buried follow fuel line to it. Also has wire terminal

COLD START SYSTEM TEST CAUTION: This test results in fuel vapor being present in engine compartment. All necessary precautions against fire or explosion should be taken. Remove 2 set screws and washers retaining cold start injectors in intake manifold. Remove the start injectors and place them in a container to collect sprayed fuel. Disconnect distributor lead from the coil. Engine Temperature Below 59 °F (15 °C) Turn ignition switch "ON" and check the cold start injectors for any leakage. Crank the engine for a few revolutions. Injectors should spray while engine cranks. Do not operate the starter any longer than necessary. 1. If injectors do not spray, crank engine and check for battery voltage at cold start injector supply (White/Pink) cable. If voltage is present, check ground connections and wiring harness connectors at cold start injectors. Repair as necessary. If no defects are found, injectors are faulty and must be replaced. 2. Crank engine and check for battery voltage at terminal 87 of cold start relay. If voltage is present, check wiring harness between relay and cold start injectors and repair as necessary. 3. Crank engine and check for battery voltage at terminal 30 of cold start relay. If no voltage is present, check supply wire from pump relay and repair as necessary. If voltage is present, relay is not being energized or contacts are faulty. 4. Crank engine and check for battery voltage at terminal 86 of cold start relay. If voltage is present, relay is not being energized or contacts are faulty. If no voltage, repair the supply wire from starter circuit. 5. Crank engine and check for battery voltage at terminal 85 of cold start relay. If voltage is present and relay is not energizing, there is a problem with thermotime switch circuit. Disconnect wiring harness from terminal 85 and jump terminal 85 to ground. Relay should now energize. If not, relay is faulty and must be replaced. 6. If relay energizes, check for battery voltage at terminal 87 of cold start relay. If no voltage is present at terminal 87, the contacts of relay are faulty and the relay must be replaced. Reinstall the cold start injectors and all cables or connectors. 7. Engine Temperature Above 59 °F (15 °C) Crank engine and check voltage at terminal 87 of cold start relay. Voltage should be 0 volts. If battery voltage is present, remove wiring harness connector from terminal 85 of the cold start relay. 1. If voltage is 0 volts, the thermotime switch is at fault and must be replaced. If battery voltage is still present at terminal 87 after disconnecting terminal 85, the replace the cold start relay. 2. If cold start injectors pass fuel when no voltage is present at terminal 87, the injectors must be replaced. 3. Page 1 of 1 FUEL INJECTION SYSTEM - LUCAS/BOSCH "P" -1986 Jaguar XJ-S 5/30/2009
FUEL PUMP RELAY TEST Turn ignition switch "ON". The fuel pump should run for 1-2 seconds and then stop. If pump does not run, or does not stop, continue testing. 1. Check that inertia switch cut-out button is pressed in. Remove inertia switch cover and attaching screws and check to see that the wiring harness connection is secure. Remove wiring harness connector from switch and check for continuity across switch terminals. 2. Pull out button on inertia switch, and check for an open circuit across switch terminals. Reconnect wiring harness connector and replace switch cover. Reset inertia switch button. 3. If inertia switch operates to specifications, ground terminal 85 of fuel pump relay and turn ignition switch "ON". Check for battery voltage at terminal 86 of main relay. If battery voltage is not present, check battery supply from ignition switch via inertia switch. 4. Check for battery voltage at terminal 87 of main relay. If no voltage is present, check for battery voltage across terminal 85 and ground connection of main relay. If voltage is now present, replace main relay. 5. Check for battery voltage at terminal 86 of pump relay. If no voltage is present, check for an open circuit between terminal 87 of main relay and terminal 86 of pump relay and correct as necessary. 6. Check for battery voltage at terminal 87 of pump relay. If no voltage is present, check for battery voltage across terminal 85 of pump relay and ground lead. If voltage is now present, replace pump relay. 7. Check for battery voltage at terminal 30 on both relays and at fuel pump positive terminal. If no voltage exists, check for an open circuit between terminal 87 of pump relay and positive terminal of pump and correct as necessary. 8. If pump still does not operate, check ground connections or replace pump. 9. Page 1 of 1 FUEL INJECTION SYSTEM - LUCAS/BOSCH "P" -1986 Jaguar XJ-S 5/30/2009

Also 38psi is a bit high on the fuel pressure 30 is where it should be, check return line.